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Building command-line tools

From: Node.js Essential Training

Video: Building command-line tools

Many modules on NPM are available as command-line tools when you install them with the -g flag. With a few quick adjustments, it's possible to turn any Node project into a command. In this video, we'll make it possible to launch an existing Node project with a command. Let's go to the exercise files. Go to chapter eight, video four and copy the start folder to the desktop. Now go to terminal and let's install the project dependencies, change directory to that folder. I'm just going to drag it in to get that path, press Return and then type NPM install and then return.

Building command-line tools

Many modules on NPM are available as command-line tools when you install them with the -g flag. With a few quick adjustments, it's possible to turn any Node project into a command. In this video, we'll make it possible to launch an existing Node project with a command. Let's go to the exercise files. Go to chapter eight, video four and copy the start folder to the desktop. Now go to terminal and let's install the project dependencies, change directory to that folder. I'm just going to drag it in to get that path, press Return and then type NPM install and then return.

So now that all the project dependencies are installed, I'm going to open the start folder in Sublime Text. First let's go to packaged.json. Currently this name is set to the default that's provided by the Express Command Line tool. We want a unique name, so I'm going to set this to airline. This is also going to serve as the name of the command that gets installed. And then also we need to add a property here. It's going to be called bin, and it's going to be set to the name of the script to run. Since Server.js is going to be executed directly by the terminal shell, we need to make a small adjustment to the file.

At the very top, we need to add a HashBang so that the shell knows to feed this entire file through Node. So let's do that now. Go to Server.js and just add that HashBang. Its going to be a hash and then an exclamation point. Then am going to type /usr/bin/env, then it's going to be a space and then node. This will ensure that the shell uses the correct node executable to run this script. Finally, we're ready to install this application as a command.

Since we're working with the project locally, we cannot use NPM-install-G to install the command. Instead, we're going to link the module. To do this, go to the root of the project in Terminal. So we're already there in the start folder. And to link this, we're going to type, npm space link, and then press Return. Now on my machine, I'm not an administrator, so it's giving me this error saying that you're not an administrator, and you don't have permissions to write to that folder. So to get around that I am going to add sudo to the beginning of this command.

So press up on the keyboard and then go to the beginning of that command and then type in sudo and then a space, now I am going to press Return and provide my password and now it installs that as a command. So, when I did that this created a symbolic link to the path where we have the project. So, be sure to put your your project in a place where it's not going to get moved. Now if you do have to move it, just run NPM link again in the new location. I'm going to close out of this terminal window, and I'm going to open up a new one.

Just so that I'm at my home folder. So now after I did that NPM link. I should be able to type airline and start the server. So now the server is listening on port 3000. And I can go to the browser and go to port 3000, and load up one of the flights. And everything is working. I'm going to go back to Terminal and close this out. So with a few small adjustments to package.json and some of your source code, you can turn any Node project into a command. The NPM link command will install the project as a global module.

In the next chapter we'll take a look at events and streams in node. In the meantime, the next video contains a challenge that will reinforce working with command line tools and

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This video is part of

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Node.js Essential Training

52 video lessons · 13256 viewers

Joseph LeBlanc
Author

 
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  1. 3m 9s
    1. Welcome
      42s
    2. What you should know before watching this course
      57s
    3. Using the exercise files
      47s
    4. Using the challenges
      43s
  2. 18m 50s
    1. Why use Node.js?
      2m 1s
    2. Choosing a Node.js installation process
      4m 56s
    3. Installing Node.js on the Mac
      2m 5s
    4. Installing Node.js on Windows
      1m 43s
    5. Installing Node.js via Node Version Manager on Ubuntu Linux
      4m 45s
    6. Installing Node.js via Node Version Manager on a Mac
      3m 20s
  3. 13m 54s
    1. Exploring language additions to the V8 JavaScript engine
      3m 38s
    2. Understanding require() and modules
      6m 39s
    3. Understanding callback execution in the event loop
      3m 37s
  4. 12m 23s
    1. Initializing Node.js projects
      2m 37s
    2. Finding an NPM
      3m 30s
    3. Maintaining projects using the npm command
      6m 16s
  5. 21m 4s
    1. Creating modules with getters and setters
      6m 33s
    2. Understanding module caching and scopes
      6m 15s
    3. Implementing JavaScript creational patterns
      5m 8s
    4. Challenge: Leveraging module caching
      55s
    5. Solution: Leveraging module caching
      2m 13s
  6. 32m 27s
    1. Starting Express applications
      3m 42s
    2. Handling GET requests returning JSON
      3m 26s
    3. Navigating large datasets using request variables in routes
      5m 4s
    4. Modifying data through PUT requests
      4m 32s
    5. Supplying middleware to modify HTTP response headers
      4m 37s
    6. Generating HTML views in Jade
      8m 9s
    7. Challenge: List all records as JSON
      37s
    8. Solution: List all records as JSON
      2m 20s
  7. 25m 37s
    1. Evaluating unit testing methodologies
      3m 8s
    2. Isolating existing code for testing
      6m 47s
    3. Supplying helpers for test data
      2m 35s
    4. Writing unit tests with Mocha
      6m 5s
    5. Simulating HTTP requests with SuperTest
      7m 2s
  8. 28m 45s
    1. Connecting to MongoDB via Mongoose
      4m 16s
    2. Defining schemas for collections in Mongoose
      3m 47s
    3. Querying MongoDB collections
      5m 32s
    4. Persisting Express sessions through MongoDB and mongo-connect
      7m 6s
    5. Logging in to Express applications using Passport
      8m 4s
  9. 21m 47s
    1. Controlling the built-in REPL
      4m 18s
    2. Constructing a custom REPL
      5m 40s
    3. Receiving command-line arguments with Optimist
      6m 14s
    4. Building command-line tools
      3m 35s
    5. Challenge: Launch a custom REPL from a command
      41s
    6. Solution: Launch a custom REPL from a command
      1m 19s
  10. 15m 46s
    1. Emitting events and attaching listeners
      5m 32s
    2. Streaming chunked data through readable streams
      2m 33s
    3. Controlling readable streams
      1m 52s
    4. Piping readable data into writable streams
      2m 10s
    5. Handling duplex streams over TCP
      3m 39s
  11. 4m 6s
    1. Deploying projects to cloud hosting services
      2m 36s
    2. Finding Node.js resources
      1m 30s

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